Answer: Different wavelengths travel at different speeds in glass.
- A Different wavelengths travel at different speeds in glass
- B Light simply bends once at the entry surface of the prism
- C Total internal reflection occurs inside the glass prism
- D The amplitude of the light wave varies with its wavelength
Correct answer: A. Different wavelengths travel at different speeds in glass
Explanation: Glass has different refractive indices for different wavelengths (violet bends most, red least). This separates colors.
Concave mirror ray construction: a ray parallel to the axis reflects through F, and a ray through F reflects parallel, locating the inverted real image. Image: Maxmath12, CC0, via Wikimedia Commons.
Concept context
Reflection, refraction, lenses, mirrors, total internal reflection.